Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quantas vezes Keith Downing deixou um cargo?
 ###Tabelas: CREATE TABLE bafa_national_leagues (bafa_national_leagues_id AUTO_INCREMENT PRIMARY KEY, Team VARCHAR, Location VARCHAR, Years in senior / adult league VARCHAR, 2013 BAFA Adult division VARCHAR, 2013 BAFA Adult flag division VARCHAR, 2013 BAFA Junior division VARCHAR, Other teams VARCHAR) CREATE TABLE tararua_district (tararua_district_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Years VARCHAR, Gender VARCHAR, Area VARCHAR, Authority VARCHAR, Decile INT, Roll INT) CREATE TABLE managerial_changes (managerial_changes_id AUTO_INCREMENT PRIMARY KEY, Team VARCHAR, Outgoing manager VARCHAR, Manner of departure VARCHAR, Date of vacancy VARCHAR, Replaced by VARCHAR, Date of appointment VARCHAR, Position in table VARCHAR) CREATE TABLE bachelorettes (bachelorettes_id AUTO_INCREMENT PRIMARY KEY, Season INT, Premiered VARCHAR, Bachelorette VARCHAR, Profile VARCHAR, Winner VARCHAR, Runner(s)-Up VARCHAR, Proposal VARCHAR) CREATE TABLE proportions (proportions_id AUTO_INCREMENT PRIMARY KEY, Benchmark VARCHAR, Crown height VARCHAR, Pavilion depth VARCHAR, Table diameter VARCHAR, Girdle thickness VARCHAR, Crown angle VARCHAR, Pavilion angle VARCHAR, Brilliance Grade VARCHAR)  
SELECT COUNT Position in managerial_changes FROM managerial_changes WHERE Outgoing manager = Keith Downing